[Phase 10] HA Deployment & Clustering

[kination]

Description

Deploy the orchestrator on EC2 in an HA configuration, clustering nodes via libcluster.

Tasks

• Configure OTP release for EC2 (Amazon Linux 2 / Ubuntu)
• Add GET /health endpoint (node status, active run count)
• Configure ALB + Auto Scaling Group (min: 2) with health check on /health
• Set up Multi-AZ EC2 deployment
• Add libcluster dependency with EC2 Strategy
• Replace Registry with Horde.Registry
• Replace DynamicSupervisor with Horde.DynamicSupervisor
• Verify task process migration on node failure